where is my refund?

I filed my taxes electronically here at turbotax on Feb 15, 2018 and it's now May 5, 2018 and I still have not recieved my refund. I recieved an email saying that both my state and federal tax has been accepted! when I wanted to track it via irs. gov "where's my refund" it says that they dont have it, and so I even called, but they stated that they have not recieved it. what is up with that? also I paid my due amounts... what could be the problem here?